Which trinket should I replace?

[:1]Hello fellow Hunter's! My Guild and I recently downed Nefarian and a nice looking trinket dropped. Prestor's Talisman of Machination (none heroic). I won the roll and receieved it. So my questions is. What trinket do I replace for Prestor's Talisman of Machination? Or do I even replace my trinkets? I have Fluid Death and Essence of the Cyclone.

Thanks.
Fluid and Essence are the best until HM Prestor's.
Alright thank you.